18.2.9. To determine the relationship between the ability to move and δsA δsV points A and B, press the rod mechanism, if the length OA = AB and angle alpha = 30 °.
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(DYNAMICS, Chapter 18 - The principle of possible displacements, paragraph - 18.2: The possible displacement of the system) of Reshebnik to the collection of short tasks on the theoretical mechanics Kep OE, JA Viba, OP Grapis, JA Svetinysh et al. Publishing Moscow / Graduate School / 1989, 2009, 2012.
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